Check-valve.



J. W. BRUNSKILL.

CHECK VALVE.

APPLICATION FILED NOV. 30. I914.

Patented Mar. 28,1916.

wi/lmemm HE COLUMBIA PLANOGRAPH 0)., WASHINGTON, D. c

' o an,

CHECK-VALVE.

Specification of Letters Patent.

Patented Mar. as, rare.

Application filed November 30, 1914. Serial No. 874,771.

To all whom it may concern: a

Be it known that I, JAMES W. BRUNSKILL, a citizen of the United States,residing at Dubuque, in the county of Dubuque and v State of Iowa, haveinvented certain new and useful Improvements in Check-Valves; and I dodeclare the following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itappertains to make and use the same.

My invention relates to improvements in check valves and moreparticularly to those designed for use in connection with air pumps vThe object of the invention is to provide an extremely simple checkvalve which may be readily applied to the cylinder of an automobile orbicycle pump, thereby preventing unnecessary wear of the flexiblepistons in such pumps, since with the present day construction, theseflexible pistons, or rather flexible piston rings must contract upon theoutward movements of the piston, to allow air to enter the lower end ofthe cylinder.

On the other hand, when the piston is forced downwardly the flexiblering must expand and contact with the cylinder. This inward and outwardmovement has been found to unnecessarily wear the piston ring, and tolikewise cause the flexible tube leading from the pump, to become wornby expansion and contraction as the piston is reciprocated. By theprovision of an inwardly opening check valve for allowing air to enterthe lower end of the cylinder, however, the flexible piston ring neednot contract, nor is the suction great enough within the cylinder tocontract the flexible tube.

In applying the invention to use, I employ certain novel features ofconstruction and combination herein described and claimed and shown inthe drawings wherein:

Figure 1 is a side elevation of an air pump equipped with the invention;Fig. 2

' view of the pump attaching member.

In these drawings forming a part of this creased in diameter ing suchends to a noticeable degree.

application, the improved valve is shown as comprising a tubularattaching member 1 which is provided with external screw threads 2 onits inner and outer ends, and with a polygonal enlargement 3 at its center. Threaded upon the outer end of the tubular member 1, is the open end4 of a valve casing 5, the latter being of cylindrica l formation andhaving its other end closed by an end wall 6 having a central opening 7,as shown. A gasket 8 is interposed between the end 4 of the cylinder 5and the enlargement 3, said end 4 being in for the purpose of form ingan enlargedarea upon which the gasket ma bear.

Slidably mounted within the cylinder 5 is a valvedisk 9whose peripheraledge is provided with a number of transverse grooves 10, said notchesincreasing in depth from one side of'the disk to the other side thereofas clearly seen in Figs. 2 and 3. The disk 9 is normally held in contactwith the end wall 6 to close the opening therein, by a coiled spring 11which is located within the cylinder 5 and bears at its opposite endsagainst the end of the attaching member 1 and against said disk.

It is important that the grooves 10 should increase in depth from theouter side of the disk to the inner side thereof, since by suchconstruction all air drawn inwardly through said notches, by means to bedescribed, is directed into the bore of the attaching member 1 vFurthermore, it will be observed that the outer end of the coil spring11 crosses the inner ends of the grooves 10, thus obstruct- Byincreasing the depth of the grooves from their outer to their innerends, however, compensation is made for the obstructionoffered by thespring, this being particularly advantageous when the valve disk 9 movesinwardly and compresses the spring.

In applying the device to use. the free end of the attaching member 1 isthreaded into an opening formed in the lower end of an upright pumpcylinder C, in which a piston P is mounted for reciprocation, saidpiston having the usual flexible packing ring R, which, when no checkvalve is employed, is adapted to yield inwardly to allow air to enterthe lower end of the cylinder, when the piston is retracted. Whenhowever, the piston is projected or forced downwardly this ring mustagain move outwardly into contact with the cylinder. This continualcontracting and expanding of the ring R causes the same to beunnecessarlly worn, while thesuction created in the lower .end of thecylinder causes the outlet tube T to expand and contract as the pistonis reciprocated. This is due to the fact that air is not allowed toreadily enter the cylinder.

By the provision of the improved check valve, however, air may easilyflow into the lower end of the cylinder when the piston is raised,thereby preventing the tube from becoming worn by the creation of apartial vacuum, and also preventing the ring R from becoming worn byexpansion and contraction, since this movement does not then take place.

From the foregoing description taken in connection with the accompanyingdrawings it will be seen that a very simple device has been provided,yet one which will increase the efliciency and life of any pump to whichit is applied.

I claim A valve comprising a cylindrical casing having in one end acentral inlet opening and in its other end a central outlet opening, avalve disk in the cylinder whose center normally closes the inletopening and whose peripheral edge is grooved transversely at intervalsto allow for the passage of air, and a coil spring in the casing hearingat one end on the outlet end thereof and at its other end against thevalve disk with its endmost convolution crossing the inner ends of thegrooves in such disk, said grooves being increased in depth from their:outer to their inner ends to compensate for the portions thereofobstructed by the spring.

In testimony whereof I have hereunto set my hand in presence of twosubscribing witnesses.

JAMES WV. BRUNSKILL. Vitnesses H. B. SPENSLEY, J. R. WESTON.

copies of this patent may be obtained for five cents eaehpby addressingthe Commissioner of Patents,

Washington, D. Q. i

